Mandrel and actuator



March 15, 1960 M. coHN MANDREL AND AcTuAToR 2 Sheets-Sheet 1 Filed Nov. 21. 1955 N y m:

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March l5, 1960 M. coHN 2,928,621

MANDREL AND ACTUATOR Filed NOV. 21, 1955 2 Sheets-Sheet 2 FIG. 4. FIG-5. fr 4 /a 40 J2 l j( 7K J4 FZ fd FIG. 7.

INVENTOR. MAX .COAW

United States Patent MANDREL AND ACTUATOR Max Cohn, South River, NJ.

Application November 21, 1955, Serial No. 547,965

13 Claims. (Cl. 242-721) The present invention relates to mandrel constructions, and in particular to an improved expandable mandrel and actuating mechanism for expanding said mandrel.

There are innumerable industrial applications for mandrels of the type including an essentially cylindrical body having one or more segments which may be expanded to effectively increase the cross section of the body. A typical application for such mandrels is as a windup shaft where a number of spaced apart cores, usually of pressboard or cardboard are to be fixed at spaced locations along the windup shaft and each arranged to receive tape or other similar strip material. Conventionally for `this application, a core holderbox is provided which is formed with a number of side by side spaced annular semi-cylindrical seats which receive the respective cores to maintain the same in a desired spaced relationship. With the spaced cores in the core holder box, the expanding mandrel is inserted into the cores and expanded to grip the cores. The unexpanded diameter of the mandrel is selected such that the mandrel may be readily inserted within the cores; and the expanded diameter of the mandrel is selected such that the cores are rigidly secured to the mandrel so that each individual core may be effectively gripped for windup of its length of strip material.

Mandrels are known in the prior art which include one or more mandrel segments which are expanded by appropriate cam and wedge mechanisms internally of the mandrel.

point of expanding the same and effecting ready release after the use of the mandrel with a particular group of cores. Further, diliiculty has been experienced in obtaining a mandrel construction which is effective throughout its length to grip the cores. that an improperly gripped core on the mandrel represents a source of faulty operation in the windup equipment and is a marked deterrent to the acceptance of a particular typev of mandrel structure for commercial use.

It is broadly an object of the present invention to provide an improved mandrel including one or more expandable segments. Specifically, it is within the contemplation of the present invention to provide an improved mandrel and actuator therefor which is constructed to be expanded by air under pressure whereby a high order of gripping force may be exerted by the mandrel on surrounding cores.

in accordance with an illustrative embodiment demonstrating features of the present invention there is provided an expanding mandrel including a shaft and me- However, it has been found diflicult to4 manipulate these mandrels particularly from the stand- It will be appreciatedA chanical air-operated expanding unit including a partI shiftable longitudinally of the shaft which is effective. to expand one or more segments of the mandrel body.

The expanding unit includes a disk spring which is loaded in response to shifting of the part relative to the shaft and mechanism arranged to be locked in the position corresponding to expansion of the mandrel throughv 'ice simple manual manipulation. Operation of the expand-v ing mechanism is achieved by an air-operated actuator. which is constructed to impart the requisite thrust to they shiftable part, bringing about the requisite expansion and enabling locking of the mandrel in its expanded.

description of a presently preferred mandrel and airoperated actuator, when taken in conjunction with the accompanying drawings wherein:

Fig. 1 is an elevational view with parts broken awayY and sectioned for the sake-of clarity, showing an im-y proved mandrel and actuator accordingl to the present invention with the mandrel supported on the actuator` and preparatory'to expansion of the mandrel, cores being removed for clarity;

Fig. 2 is an enlarged fragmentary elevational View of the right end of the mandrel illustrated in Fig, l and the.

associated actuating structure, the actuator being shown in a position of travel during advance toward -the adjacent end of the mandrel;

Fig. 3 is a view similar to Fig. 2 but showingthe actuator in engagement with the adjacent end of the mandrel, the parts being illustrated in their relative position after expansion of the mandrel;

Fig. 4 is a sectional view on an enlarged scale taken substantially along the line 4-l4 of Fig. l and looking in the direction of the arrows;

Fig. 5 -is a fragmentary longitudinal section of the right end of the mandrel illustrated in Fig. l, showing the details of the expanding and locking mechanisms with the mandrel in its unexpanded condition;

Fig. 6 is a view similar to Fig. 5 but showing the expanding mechanism after loading by the actuator (see panded position;

Fig. 7 is a view similar to Fig. 6 but showing the parts of the expanding and locking mechanism after the mandrel is locked in its expanded condition; and

Fig. 8 is a sectional view taken substantially along the line 8 8 of Fig. 7 and looking in the direction of the arrows.

Referring now specifically to the drawings, there is shown in Fig. 1 an expandable mandrel 10 in accordance with the present invention which is supported on an airoperated actuator, generally designated by the reference numeral 100. The details of the mandrel 10 Vwill be described in conjunction with Figs. 1 and 4 8 inclusive, while the details of the actuator willl be described in conjunction with Figs. 1-3 inclusive. Y v

Referring first to the structure of the mandrel 10, the same is seen to include a body 12 supported on a main shaft 14 having end portions 14a, Mb projecting beyond the opposite ends of the body 12. The body 12, as seen in Fig. 4, includes three segments Y16, 1S, 20 which together cooperate to define a generally cylindrical outer surface. The segments 16, 18, 20 are mounted by inwardly projected ribs 16a, 18a, and 20a confined for radial sliding movement on appropriate spiders 22 which are disposed at spaced locations along the length of the shaft 14 and are supported on a sleeve 24. The sleeve 24 isconcentric with and slidably supported on the shaft 14. Although only one spider 22 is seen in the drawings for supporting the mandrel segments for radial adjustment, it will be appreciated that a number of such spiders are disposed along the length of the sleeve 24,

depending of course upon the length of the mandrel,

2,923,621 Patented Mar. 15, 1960 @easiest more expandable segments, inlieu4 of the ,illustrated .Y

structure wherein .the1 body 12 isentirelyrnade up of-V expandable segments. When eonstructingsmall diameter mandrelsfitmay be structurally necessarylto have but a single expanding' segmentfand accordinglyV the disclosure iti this -respectshould be afforded a latitude of' interpretationand substitution. Y. e l

The segments 16, 1,8, 20 are limited in theirexpandingmovementrrelative to the shaft 1'4'by the-provision off split lock ringsgof springy material 26, 28 which arear ranged atopposite ends of-the mandrel body12.- As seen in Fig.4 l,4 at the left endof the-mandrelfthere is provided an annular internal Yseat 303` which accommodates `the lock-ring 26; similarly atfthe rightend of the mandrel, and as seen best in` Figs; 5""to 7 inclusive, there is provided a furtherA annularseat 12 for the lock-ring 28j` The `loclt-` rings 26, 2S, in conjunction with* kthe spreading orI expanding mechanisms to be described keep the" several mandrel partsA invassembly,` yetv allow for the expansion of themandrel.

The sleeve 24 which is slidably supported on the'shaft 1 4 carries, on it a number of wedge members 34 each ofY which has a1 conical camming `surface V36. The respec-j tive wedgev memberst34 are adjustable along the-length ofitheesleeve V24 whiclris externally threaded; the indi vidual wedge members maybe locked in various positions of adjustment through provision of: follower nuts 38.,- The interior of therespective mandrel segmentsl,V

13 and 20 are provided with camming'surfaces 40 which its unloaded Vcondition isyofgenerallydished configura-- are complementary to the surfaces 36 `of the respective wedgingor spreadingmembers` 34 and in contact therewith.

The assembly ofthe sleeve 24and lthe several wedging members34 are maintained in a normal position relative tothe associated camming surfaces 40 and axially of the shaft 14, through provision of acoilrspring 42. The spring 42 bears against the shoulder of a collar` or stop 44 xed to the shaft 14 and against the adjacent wedge member onthe ,sleeve 24. It will be appreciated that as the sleeve 24 and4 the associatedvwedge members; 34 are displaced to the left in Fig. l relativeA to the shaft 14. as a reference, the segments-16, 18, and 20A wi-lljbe expanded. Thedegree of expansion will of course`bedetermined'by'the lengthwise travel or stroke ofjthe sleeve 24 relative `to the Vshaft 14. 4Adjustment of therespective wedge. members 34' relativeto the associated` camrningk surfaces 40 in a group allows for greater or lesser ex.'-

pansion for aA given thrust or stroke; further, adjustment vof the individual wedge members relative to their asso.- Y.

pandedrcondition. Specifically, the unit 46 includes a rotatable shell or housing 48 appropriately knurled on its outer surface to facilitate easy gripping and mounted to'be turnable about the shaft 14 and shiftable` along the shaft 14, Specifically, the housing 48 includes an end member or abutment 50 which is in bearing contact with and journaled on anv enlarged sleeve 52 on the shaft 14; a lock plate 54 isV likewisesecnred tothe housing 48 and journaled* on thesleeve 52u carried bythe shaft 14. Thus, the assembly of` the housingf48, the end member or abutment 50 and` the lock, plate 54 are turnable as a unit--about'the-fixed` assernblyfofA theA shaft 14 and the sleeve 52 and to a, limited extent is shiftable along the shaft 14 toward the mandrel body 12. t

Within the open end of -the housing 48 which faces toward thermandrel body 12, there is provided a thrust bearing which includes a raceway4 part 56 loosely journaled-V on; thev sleeve 52 and havinglansannular raceway 5,8, which; accommodates a; plurality4 of ball bearings 6i) carriedfinv aball bearing cage 62. The ball bearings 60 bear againstthe adjacent face of the lock plate 54'. Secured-to thevsleeveI 2'4attl1e'-r i`gli t'l endof the mandrel body'121is a collarJ 64# having an` abutment surface'66 facingthesurface- 68"-ofv theY thrust part 56 which isremote-from the racewayf 58;. Between; the abutment surfaces 66;V 68AV there" is disposed a4 fBellevillell disk spring 70"'whiehis loosely supported: on the-shaft 14 andin tion, as illustrated inFigzgS. [In response tothe appli cationof` load to theexpanding andi'locking-unit 46, as

indicatedgby the directional i arrows -72 ,4 a spreading force` is provided to the respective mandrel sections orseg.l lments 16, 18, 20: through agat' diskV spring 70 and the associated components; The` diskA spr-ingv 70 as well as lthe coilyspring'42 provide a-reactingforce tothe loading 72. The parts are-arranged,v such-that the longitudinal shifting of the u nit46 toward; the mandrel,V body 12, as may `beappreciated by progressively?.inspecting Figs. 5

and 6,. causesjexpansion of the mandrel. The degree of` expansion may be'observedfby` noting' the relationship of the outerperipheryof themandrel 12l relative to the outer periphery-ofthe unit 46.' as a reference` in Fig. 5, andthe somewhat expanded p ositionlof the routerperi heryA of` the mandreP 12j` relative to said reference surfacerin'lFig. 6;, l

Onitheamamshaft' 14therei`su carried a transverse stub shaft74' which-'hasH itsv opposite ends projecting into the housing or enclosure,;46. Y'Supported on the-shaft 74 are rollers 76, 78j each ofi which is journaled by ball bearings. The rollers 76; 781are arranged tov cooperate with the lbckingplate 54j for the4 purposey of fixingythe sleeve- 24 t relative to the shaft 1,4" in theV expandedcondition of; the

mandrelbody 12: As'seen best inl Fig; 8 the'face of the lock-ing plate.- directed; toward therollers 76; 7%, thatis the. faceremote fromV the ball` bearings is provided v with opposed arcuate depressions 80,- 82, which are comments of the mandrel mayl be fabricated ofextruded mag. l

depressions 80,' 82 extend inwardlyv from the flats84, 86. The parts areinitially dimensioned and'assembledgin thenesium or aluminum to allow for the slight differences in` expansion throughout their length, if necessary; VAlthough the outer peripheral surfaces of the mandrel segments or sections 16; 18, andvZl areillustrated as being smooth and continuous, it will be apl'areciated4 that these. surfaces may Vbe provided with integral ridges orY projections to enhance their gripping qualities. l

On the right endportion of the shaft 14' and to end lalignment with the mandrel body` 12 is; an expandingandy locking unit, generally .designated by the referencenumeral 46,- which may be displaced along the shaft 14 to lurge the'sleeve 24v axially and `to the left;

plementary to the curvature of therollers 76', 'i8e Theser unexpanded condition ofthe mandrel', as shown in Fig. 5,'

' with the rollers 76787resting in the corresponding, arcuate depressions y8|), 82;V Uponl axialshiftofthe locking plate 54 to the left with the housingpart 48 of' the unit` 46', the locking plate is movedV into, a `position wherein the flats 84, 8 6 lie substantially'` in theplane of the adja` and" 81. This is achieved by a simple turning ofthe housingAS, the abutment mernberytl,` and the lock plate S4. as aV unit. in the counterlockwise direction about the shaft 14, as viewed in Fig. vSfor'fromthe `rightof Figs. 5, 64 and`7,.V .When Vturned tolthevposition of Figs. 7I and8 the rollers 76V,4 78 co'operatefwiththeriseeportions orats 84, 86 of the locking plate 54 to maintain the sleeve against return motion through the predetermined thrust corresponding to loading, and against the reaction force of the disk spring 70 which is seen in Figs. 6 and 7 to be somewhat flattened as compared to the condition illustrated in Fig. 5. When the rollers 76, 78 are on the flats 84, 86, the Belleville spring 70 urges the mandrel segment or segments outwardly, with a high order of live loading, and into contact with the cores arranged at spaced locations along the mandrel; and if the cores, which usually are of paper tend to stretch or expand during the loading or the winding operation, the Belleville disk spring exerts the requisite live loading force to urge the mandrel segments into tight gripping contact with the cores to preclude any possibility of slippage.

Reference will now be made to Figs. 1-3 and the details of the air-operated actuating mechanism 100 which is employed to engage the unit 46 and shift the same through the requisite thrust for expansion of the mandrel as described. Specifically, the actuator 100 in-` cludes a hollow base 102 having an upstanding bracket 104 at one end thereof.` The bracket 104 carries an end stop 106 formed with a socket 108, the end stop 106 being adjustable in relation to the bracket 104 through provision of a threaded supporting shaft 110, lock nuts 112, 114 and a hand wheel 116. Further the end stop 106 with its socket 108 is mounted for vertical adjustability by means of an appropriate thrust vbearing (not shown) to automatically accommodate the shaft position when the mandrel is expanded. The base 102 carries appropriate upstanding cradle members 11S, 120 upon which the mandrel may be supportedA with the end portion 14a in the socket 108. l

Within the hollow base 102, there is arranged an air cylinder 122 connected to an appropriate source of air under pressure through valving, as is well understood in the art. Within the air cylinder 122 is a piston (not shown) which is operatively connected to a piston rod 124 in turn pivotally connected to a movable carriage 126 mounted on rollers 128 riding on appropriate tracks 130 on the floor of the base 102.

The carriage 126 is provided with an inclined runup track 1,31 which continues onto an inclined camming surface 132. Cooperating with the movable carriage 126 is an actuating member 134 which is in the form of a bell crank lever pivoted at 136 on a Vslide block 138. The block 138 is appropriately confined by the guide members 140, 142 for sliding movement along a predetermined vertical path from the base to an upper limit, as determined by the surface 142e of the bracket or guide member 142. On the rearwardly-projecting arm of the bell crank actuating member 134 there is provided a cam follower or roller 144 which is adapted to ride up the runup track 131 and onto the cam surface 132, as may be appreciated by progressively inspecting Figs. 1-3 inclusive. The. upwardly-extending arm of the member 134 is bifurcated and carries a pair of rollers 146 which, as seen in Fig. 6, engage Athe abutment member 50 to provide the requisite shifting force, as designated by the arrows 72 in Fig. 5.

The operation of the actuator will now be described in conjunction with Figs. 1-3:

Upon application of air through the valving system to the cylinder 122, the piston 124 is displaced toward the right urging the carriage 126 to the right and causing the follower 144 to ride up the vsurface 131 and onto the cam surface 132. An intermediate position ofthe actuating member 134 is illustrated inFig. 2 with the roller 144 on runup surface 131. When the roller 144 reaches the beginning of the camming surface 132 the slide block 138 reaches its limit position in contact with the stop 142e and continued displacement of the carriage to the right causes the bell crank 134 to be pivoted about its axis 136 in the counterclockwise direction. The degree of. pivoting is of course determined by the slope Aof the camming surface 132. During the counterclockwise rocking of the actuating member 134, the rollers 146 straddle the adjacent end 14h of the shaft and contact the end member 50 of the unit 46. The degree of thrustl imparted to the unit 46 is selected to expand the mandrel and bring the locking plate 54 into the position of Fig. 6 wherein it is ready to receive the locking rollers 76, 78, as previously described in detail. With the mandrel loaded into its extended or expanded condition and while still held in 'the actuator (as shown in Fig. 3), the operator grasps the knurled casing or housing 48 andl rotates the same in the counterclockwise direction to bring flats of the locking plate 54 into contact with the adjacent peripheral surfaces of the rollers 76, 78 to lock the mandrel in the expanded condition. Thereupon, the air pressure may be released permitting the expanded mandrel to be removed from the actuator for use. Turning of the unit-46 to achieve locking While loaded does not require an inordinate amount of strength due to the rolling contact between the rollers 146 and the member 50 and the provision of the thrust bearing for the locking plate 54.

After the mandrel has been used in the expanded condition, the mandrel may be restored to its normal'condition by turning the head end or unit 46 in the clockwise direction to bring the cylindrical depressions 80, 82 into registry with therespective rollers 76, 78. When the locking is released, the unit automatically restores itself to its unlocked condition.

lin lieu of providing ridges on the peripheral surfaces of the mandrel to enhance gripping, it is equally within the contemplation of the invention to provide a multiplicity of apertures in the peripheral surfaces of the mandrel body.` Upon expansion with this type of mandrel' body, there is 'a tendency for the cores to embed into the apertures to lock the cores to the mandrel body.

From the foregoing detailed description it will be appreciated that numerous modifications may be made without departing from the spirit and scope of the invention, and accordingly the appended claims should be construed broadly and as is consistent with the disclosure herein. In some instances certain features of the invention will be used without a corresponding use of other features.

1 What I claim is: r1. An expandable mandrel :comprising a shaft, a sleeve on said shaft slidable relative to said shaft, a multiple segment :mandrel body surrounding said shaft, means operatively connected to at least one of saidA segments and mounting said one segment for limited radial movement relative to said shaft, said one segment being formed with a camming surface, means on said sleeve in urged engagement with said camming surface and arranged to expand said one segment in response to movement of said sleeve in one direction through a prescribed. thrust, spring means resisting movement of said sleeve in said one direction, cooperating locking means operatively connected to said shaft and engageable when said sleeve is urged through said prescribed thrust, said cooperating lock means including rollers on said shaft and a lock plate rotatably mounted on said shaft and shiftable into position to receive said rollers in response to movement of said sleeve through said prescribed thrust, said lock plate being turnable about said shaft in said position to engage said rollers and to lock said sleeve against return movement through said prescribed thrust, and means operative to drive said sleeve through said prescribed thrust. .y

2. An expandable mandrel comprising a shaft, a sleeve on said shaft slidable relative to said shaft, a multiple segment mandrel body surrounding said shaft, means operatively connected te at least one of said segments and mounting said one segment for limited radial movement relative to said shaft, said one segment being mounted in movable relation to said shaft and to the other segments meander:

ofisaidmandrelibody along the entire length of sa'dgone Segment, said one segment being-fernredwith acaniming surface, means on said sleeve in urgedgengage'rnent' with Saidammiilg Surface and arrangedV toexpand said onel segmentrv in response to movement 'of' said sleeve in one direction through, a Aprescribed thrust, spring means re-4 sisting movementof said sleeve in said one direction;Y

locking means operatively connected to' said shaft` and.l

engageablelwhen sai'd sleeve is urged through' Said pre-V scribed thrust, andmeans operative to drive said' sleevey through said. prescribed thrust. Y

` expandable mandrel comprising a shaft, a sleeve on said shaft slidable relative-to said shaft, a round mandrel body having plural segments surrounding said shaftL means operatively connected to said segments mounting said ,segments for limited radial movement relative to` said. shafheach of said segments beingjinounted" in movable relation to Isai'dl shaft and to the' other segments ofV said mandrel body along theentirelengtho'fsaidseg ments, slaidsegmcnts being' formed withcammingsurffaces', wedge means on said sleeve` in urgedeng'agement with the respective lcamming surfaces andA arranged to` expandzsaid segments. in reispoiisejto` movementfof "said,

sleevethrough said; prescribed* thrust, saidloelcplate being; turnable aboutsaid'shaftin saidipositorrto" engage S'di rollersb andtorloclcj said' sleeve against retnrnmovement, through saidL prescribedV thrust; aridi 'airfactua'ted means engageable,y against said; housing and' (ip efrativeJ to drive said" sleeve throughsaidprescribedjthiust.

6'. In? combination, an expandableI mandrel comprising a shaft,V a sleeve on' saidl straft movable-relative, to said".

shaft; a multiple segrneiitmandrelbody surroundinggsaid sleeve' in onejdirection through a prescribed thrust, springr means resisting mov'ei'nliit"` of direction, cooperating lockingmeans;V operatively con-` n eted to saidfshaftand engageable when' said-'sleevcfisurged through said prescribed thrust-and means operative'A to drive said sleeve through said prescribed thrust.`

4. `In combination, an expandable mandrel comprising a,sh af,t, a sleeve on said shaft slidablerelative to saidV shaft, a multiple segment mandrel body surrounding said shaft, means operatively connected toat least one ofsaid segmentsl mounting saidv one segment for, limited radialvv movement relative to said shaft, said one segment being formed-with a camming surface, means onsaid sleeve insaid!V sleeve; in i said oneY urged engagement with said camming surface andV ar p rangedto expand said one segment in response toY m'ovementv of saidV sleeve in one direction through av prescribedV thrust, spring means resisting movement o'fj saidfsleeve in saidone direction, cooperating locking means oper'- atiyely: connected to said shaft andI engageablewhen saidI sleeve is urged through said prescribed thrust, saidY cooperating lock means including rolling contact merribeisV l,

on said shaft `and a lock plate rotatably mounted on said shaft.andshiftableinto a locking position toi-receive` saidV contact members in response to movement off'said sleeveV through said prescribed thrustsaid lock plate being-turn# able about said shaft fins'aid locking'position. to engage' ments mounting said one segment for limited radialinove-v ment relative to` said main shaft, said one segment being: formed with` a camining surface, wedge means on' said sleeve in engagement with said cammingl surface and arranged to expand saidV one segment in response' to longitudinal movement of said sleeve relative to said shaft inone direction through a prescribed thrust, spring means resisting movement of said sleeve in said one direction, a' turnable housing on said shaft andshiftable longitudi nally' of said shaft,` c coperatingilocking means operativelyF connectedl to said shaft and engageable when said sleeve kis-iirged through said prescribed-thrust, said cooperating lockrneans includingl rollers on-said shaft and a lock plate coiiiiected-to-said housing and shiftable into position to` receive4 said rollers in response=f to movement oi:`ffrsaid=A shaft, means operatively'connected tcr atleastoneof said segments mounting said one segment' for expansion relative to said shaft, said one segment being formed` with' a carrirriiiigi surface, means on saidl sleeve in engagement' with Said' Qammingj surface and arranged' to expandfv said` onefsegment in response to'movernent of said sleeve in' one direction throughV a `prescribed thrust, means includ: inga fiat springgjresisting movciruent"y of said' sleeve insaid one direction, cooperatingflocking` means operativelyconf K nected; toY said" shaft; and: engageblefwheri said sleeve is. urged throughV said'pies'eribedgthrust, and air-actuated mean'sjoperative to drive-said S14-eve-V througlrsaid scribed thrust; said,` aireactuated meansincludingy an end` atop adaptedto` engage: against' one` end oftsaidfsliaft,

actuating head;V rneansmountiiig actuating head for movement intoV alignment Withlthel otherleridfof said'sliaft; I andformov'ementin a direetionto'j shift said "sleeveilongit'iidi'nal-ly of* said shaft; andl meansrincluding a cylinder and a pistonoperatingthereinl for; Vmoving said# actuating head;v

7'. Anlexpandable mandrel'c'oinprisinga shaft, a sleeveA on said shaftnlidablel relative'to said-shaft, a mandrel-` bodyf having an eiqaandabl'e segment surrounding said shaft, means operativelyJ connected to said segment and` mounting said segment` for limited radial movement relative Vto said shaft, a said segmentw beingM formed -w-ith; cammin'gisurfaeesiall facingv` in tlie-same direction, means on` said sleeve allE facingadirection totengage'said camming surf-ace and alrranged-'to-expand said segmentV in response tomovement ofV said sleevefinonc direction through a prescribedetlirust, spring 'means resisting`V movei ment of said sleeve in said oiiedirecti'on, ,cooperating locking meansY operatively-*connected to said shaft and engageable -i'nfaY prescribed position of adjustment when said sleeve isiirgedy through saidprescribedl thrust to-l'ocl:

' said sleeve againstireturiiY movement through said pre'- scribed thrust, and actuating means operative to drive said sleeve throughL said prescribed thrust.

8L Ari; expandablemandrel comprisingv a shaft, a sleeve" onfsaid'sljaftslidable relative t'o s'aic shaft, a' mandrel bodyV havingV an expandable `segment' surrounding saidt shaft,- ineaiis ,opeivativel'yf` connectedf to said segment and mounting*V s'aidsegment for limited radial .movement rela tive to said sha-ft; said' segment being formed: with a` oaminingf surface, means onvsaidi` sleeveinV urged engagementI with saidl cammingjsurfa'cc and arranged` to expand said segment in Iresponse to movementfof' said sleeve in .l one direction through al prescribed thrust, spring means resistingmovement; ofl s'aid sleeve'ini said one direction,

cooperating locking means' operatively connectedl to saidv shaft and engageablein a prescribedposition of adjustment when said sleeve is. urged through saidvprescribed thrust to lock said sleevel against return. movementl through said prescribedl thrust, andi actuating, means op ,erative to drivel'saidl sleevetlirough said prescribed thrust,` said actuatingmea'ns includinga'basereceiving said inan-` drol andincluding an endrstopy engaging against one` end of said shaft, an Vactuating head, meansmounting1 said actuating heady formovententf into` alignment with the other endof said shaft'and for'iriovernent` in a directionV to` shift said .sleeve longitudinally of said shaft, and means; operatively connected to'and moving' said actuating head to driveV saidf sleeve through said prescribed*thi-ust.`

9.' An expandable mandrel comprising a sliaft,.a sleeve,y onrsaid shaft slidable relativeV to` said shaft, a mandrel` body` having anexpandab1e3segmentsiirrofunding. said.`

shaft, means operatively connected to said segment and mounting said segment for limited radial movement relative to said shaft, said segment being formed with a camming surface, means on said sleeve in urged engagement with said camming surface and arranged to expand said segment in response to movement of said sleeve in one direction through a prescribed thrust, spring means resisting movement of said sleeve in said one direction, cooperating locking means operatively connected to said shaft and engageable in a prescribed position of adjustment when said sleeve is urged through said prescribed thrust to lock said sleeve against return movement through said prescribed thrust, and actuating means operative to drive said sleeve through said prescribed thrust, said actuating means including a base receiving said mandrel and including an end stop engaging against one end of said shaft, an actuating head, means mounting said actuating head for movement into alignment with the other end of said shaft and for movement in a direction to shift said sleeve longitudinally of said shaft, and means including an air cylinder and a piston operating therein for moving said actuating head to drive said sleeve through said prescribed thrust.

10. An expandable mandrel comprising a shaft, a sleeve on said shaft slidable relative to said shaft, a mandrel body having an expandable segment surrounding said shaft, means operatively connected to said segment and mounting said segment for limited radial movement relative to said shaft, means on said sleeve in urged engagement with said segment to expand said segment in response to movement of said sleeve in one direction through a prescribed thrust, spring means resisting movement of said sleeve in said one direction, cooperating locking means operatively connected to said shaft and engageable in a-prescribed position of adjustment when said sleeve is urged through said prescribed thrust to lock said sleeve against return movement through said prescribed thrust, and actuating means operative to drive said sleeve through said prescribed thrust, said actuating means including a base receiving said mandrel and including an end stop engaging against one end of said shaft, an actuating head, means mounting said actuating head for movement into alignment with the other end of said shaft and for movement in a direction to shift said sleeve longitudinally of said shaft, and means operatively connected to said actuating head for moving said actuating head to drive said sleeve through said prescribed thrust.

11. An actuator for expanding an expandable mandrel having a shaft and a part shiftable relative to said shaft mounting member, means on said base mounting said f member for movement through a prescribed linear thrust, an actuatlng head, means pivotally mounting said actuating head on said mounting member for pivotal movement through a prescribed arcuate thrust, and means engagmg said actuating head for moving said member Y through said prescribed linear thrust to bring said actuating head into an operative position contiguous to the other end of said shaft and for pivoting said actuating head through said prescribed arcuate thrust into engagement with said part for shifting said part relative to said shaft with said stop means providing a reaction force to said actuating head.

12. An actuator according to claim 11 whereinthe means which engages said head includes an air cylinder and a piston operating therein.

18. An actuator for expanding an expandable mandrel having a shaft Vand a part shiftable relative to said shaft to expand said mandrel comprising a base, cradle means on said base adapted to receive said mandrel, stop means on said base adapted to engage one end of said shaft, a mounting member, means on said base mounting said member for vertical movement through a prescribed linear thrust, an actuating head, means pivotally mounting said actuating head on said mounting member for pivotal movement through a prescribed arcuate thrust, and means engaging said actuating head and including a cam and follower for moving said member through said prescribed linear thrust to bring said actuating head into an operative position contiguous to the other end of said shaft and for pivoting said actuating head through said prescribed arcuate thrust into engagement with said part for shifting said part relative to said shaft with said stop means providing a reaction force to said actuating head.

References Cited in the le of this patent UNITED STATES PATENTS Spahn Mar. 20, 

